Female and male coupling in steel, with some stressed tempered or carbonitrited areas. Springs in AISI and C98 steel, seals in polyurethane and NBR. (7)
Female and male couplings in steel, with some hardened areas, in correspondence to the most stressed points. Springs in C98 steel, seals in NBR (other materials on request) and Back-up Ring in PTFE. (9)
High-quality materials (4)